2. JVM Troubleshooting Guide

3. JUnit Tutorial for Unit Testing

4. Java Annotations Tutorial3>

5. Java Interview Questions

and many more ....

It seems that a new paradigm is coming. Facebook and Netflix have come up with different implementations for that idea. Some people are calling it Demand-Driven Architecture, but before I show you some solutions, let’s go over some history to understand the problem. I will use the example that Netflix provides, but I think that most of us will find ...

I’ve stumbled upon this very interesting question on Stack Overflow, recently. Its title is: [How to] compare a number with sum of subset of numbers In this article, we’ll compare the user’s imperative approach to the extremely elegant (Oracle) SQL approach. We’ll be making use of any combination of these awesome SQL features: Window functions FIRST and LAST functions, ...

Recently there was a Kickstarter about “an Arduino that runs Python”, the WiPy. This is a small IoT board with WiFi on it (which is not available on stock Arduinos) for an attractive price. And being able to use a high level language along with a lot of existing libraries makes it attractive too. A few days ago I got ...

MVP is an acronym for Minimum Viable Product. Ever since the Lean Startup book and movement appeared, it has become the staple of “successfully building the right product”. It’s pretty clear, right? Minimum – it contains just the needed features that enable us to make money. Viable – people are willing to give us money for it. Product – It’s sort-of-a-tangible thing ...

Background Many enterprises today are extremely excited about the prospects of containerized application stacks to achieve application portability and to speed up application deployment. However we met with many enterprise customers that are still concerned about how this containerization effort would fit into their existing workflows and processes. In almost every large organization we talked to, Oracle database is still ...

In a previous blog post I had covered the motivation for needing a library like Netflix Hystrix. Here I will jump into some of the very basic ways to start using Hystrix and follow it up with more complex use cases. Hello World A simple Hello World example of a “Hystrix Command” is the following: import com.netflix.hystrix.HystrixCommand; import com.netflix.hystrix.HystrixCommandGroupKey; import ...

Background While application portability (i.e. being able to run the same application on any Linux host) is still the leading driver for the adoption of Linux Containers, another key advantages is being able to optimize server utilization so that you can use every bit of compute. Of course, for upstream environments, like PROD, you may still want to dedicate more ...

Couchbase 4.0 provides lots of features that allows you to develop with agility and operate at any scale. Some of the features that allow you to operate at any scale are: Elastic Scalability Consistent High Performance Always-On Availability Multi-Data Center Deployment Simple and Powerful Administration Enterprise-grade Security Learn more about these enterprise features at couchbase.com/operate-at-any-scale. A complete overview is available in Couchbase Server 4.0 datasheet. This ...

I just delivered a 4-day deep-dive training course on Docker and Kubernetes to a customer in Atlanta. In true open-source spirit, I’d like to publish the source/slides and allow other people to benefit from it and contribute to making it better. Kubernetes is such an awesome project, and I learned a lot by doing this training. If you’re interested in ...

Instead of writing a blogpost, I should be cleaning and packing. Actually, JavaOne is just around the corner and beside my own two sessions about Apache Camel and the future of integration, I’m really looking forward to the Docker for Java EE developers Hands On Lab. A lot of preparations went into this one and it has been given some ...

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